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Nearly 1 in 4 Americans is deficient in Vitamin D. How do you know if you're one of them?Many over-the-counter vitamin D supplements range from 25 to 125 mcg (1,000 to 5,000 IU). You shouldn't take more than 100 mcg (4,000 IU) of vitamin D in a day unless a doctor recommends you do so ...
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